Automobile crankshaft bearing ring fault diagnosis and eliminate

1 fault phenomenon. When a machine speed suddenly change, there are clear and heavy continuous 'Cheng chamber' sound, accompanied by a machine vibration phenomenon. 2. A machine speed increases, noise increases. 3. Change a machine load, and the noise. Second, the trouble reason 1. Crankshaft crankshaft journal bearing with wear, makes the fitting clearance between the larger, the voice. 2. Crankshaft bearing of the bolt is loose. 3. Crankshaft bearing smooth bad make alloy burnt or shattered. 4. Crank shaft axial clearance is too large, the crankshaft before and after the move, axial end face and the crankshaft thrust washer hit each other and rattled. 5. The crankshaft bent, broken, produce sound during operation. 6. The flywheel bolt is loose. Third, fault diagnosis and eliminate 1. Remove the oil filling flap, give ear to the oil filling mouth examine listens, repeated change a machine speed halt at the same time. Launch machine speed suddenly change, a depressing continuous 'Cheng Cheng' metal tapping, serious when large vibration of the launch timing to clarify the crankshaft bearing ring 2. Application of single cylinder broken fire experiment, the sound did not change, then apply the adjacent two cylinder fire experiment. If a cylinder is broken after the fire, two noise significantly weaken, clarify is this the crankshaft bearing ring between the two cylinder 3. Make a machine at high speed, large vibration of the grasp of the opportunity with oil pressure will be obvious descent. It expounds the crankshaft bearing clearance is too large or bearing alloy layer and 4. Put the oil, remove the oil sump inspection ( 1) Found in the oil or oil sump wall bearing alloy particles, clarify the crankshaft bearing alloy is shattered, should change new the same level of bearing. ( 2) Can check the crankshaft bearing cap bolts loose, if loose, should according to the rules of the torque tightened. ( 3) By checking the crankshaft bearing clearance can check the bearing clearance is too large. If is too big, should be a change in the same level of new bearings. 5. When on the clutch pedal, noise weakened or lost. With the lever move flywheel or the crank arm. If the axial momentum is too big, should be a change in thrust bearings. 6. With the increase of launch machine temperature ( Oil viscosity lower) , noise increased obviously, when a machine speed to high speed, the noise is mixed and disorderly phenomenon, clarify the crankshaft bending, should remove the alignment ( Or change) 。 7. If the noise present in the rear of a machine, and in machine speed suddenly raise or lower by instantly let out a loud sound, clarify the flywheel bolt looseness, should according to the rules of the torque tightened.